List of top Chemistry Questions asked in JEE Main

The correct structures of trans-[NiBr₂(PPh₃)₂] and meridional-[Co(NH₃)₃(NO₂)₃], respectively, are : 

Which of the following reagent is used for the following reaction ? $CH_3CH_2CH_3 \to CH_3CH_2CHO$
Given below are two statements : Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II : Bio-degradable detergents lead to eutrophication. In the light of the above statements, choose the most appropriate answer from the options given below :
The correct shape and I-I-I bond angles respectively in $I_3^-$ ion are :

The compound/s which will show significant intermolecular H-bonding is/are : 

 

Consider the above reaction and identify "Y". 

Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is :

What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene ? 

The bond order and magnetic behaviour of O\(_2^-\) ion are, respectively :
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Lithium halides are some what covalent in nature.
Reason R : Lithium possess high polarisation capability.
In the light of the above statements, choose the most appropriate answer from the options given below :
Spin only magnetic moment in BM of \( [\text{Fe(CO)}_4(\text{C}_2\text{O}_4)]^+ \) is :

The major product formed in the following reaction is : 

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :

The correct options for the products A and B of the following reactions are : 

The parameters of the unit cell of a substance are a = 2.5, b = 3.0, c = 4.0, $\alpha=90^\circ, \beta=120^\circ, \gamma=90^\circ$. The crystal system of the substance is :
The nature of oxides V\(_2\)O\(_3\) and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is:
The interaction energy of London forces between two particles is proportional to r\(^x\), where r is the distance between the particles. The value of x is :
The sol given below with negatively charged colloidal particles is :
Given below are two statements :
Statement I: Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper.
Statement II: It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Heavy water is used for the study of reaction mechanism.
Reason (R): The rate of reaction for the cleavage of O-H bond is slower than that of O-D bond.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Barium carbonate is insoluble in water and is highly stable.
Reason (R) : The thermal stability of the carbonates increases with increasing cationic size.
Choose the most appropriate answer from the options given below :

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. 

 

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Photochemical smog causes cracking of rubber.
Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.
Choose the most appropriate answer from the options given below :
The number of stereoisomers possible for 1,2-dimethyl cyclopropane is :

Consider the given reaction, the Product A is: